Call Before You Dig! Dial 811 if you plan to: dig more than 12 inches deep; install a fence; build a deck; plant trees; build a shed; dig a well or septic tank; install sprinkler systems; or install private utilities to a shop, barn, garage or greenhouse. Make sure to call at least 48 hours before you plan to dig. The center will then notify agencies and utilities in your area to mark their lines. For more information please call Public Works at 360-293-1919.